WorldChanging favorite Green Car Congress has an informative post up today about new developments in biohydrogen generation discussed at this week's 228th meeting of the American Chemical Society. Since the most efficient current methods of generating hydrogen involve electricity (likely not from a renewable source) and natural gas (a non-renewable resource), and result in carbon emissions, looking for ways of getting economically useful amounts of hydrogen from renewable biomass is a Good Idea. GCC lists and links to some of the developments -- including a new method of increasing the efficiency of photochemical hydrogen production from water.